Synthesis, structures, and catalytic properties for ethylene polymerization of bridged [η5,η1-C5H4CHPhArO]TiCl2 complexes

A number of bridged half-sandwich titanium complexes [η5:η1-2-C5H4CHPh-4-R1-6-R2C6H2O]TiCl2 [R1 = H (5), Me (6), tBu (7, 8); R2 = H (6, 7), tBu (5, 8)] were synthesized and characterized by elemental analyses,1H, 13C NMR. Molecular structures of complexes 5 and 8 were determined by single crystal X-ray diffraction analysis. Upon activation with AliBu3/Ph3CB (C6F5)4, complexes 5-8 exhibit reasonable catalytic activity for ethylene polymerization and copolymerization with 1-hexene.